EP0962312A2 - Leicht zu öffnender Behälter und dafür geeignete Behältereinheit - Google Patents

Leicht zu öffnender Behälter und dafür geeignete Behältereinheit Download PDF

Info

Publication number
EP0962312A2
EP0962312A2 EP99304317A EP99304317A EP0962312A2 EP 0962312 A2 EP0962312 A2 EP 0962312A2 EP 99304317 A EP99304317 A EP 99304317A EP 99304317 A EP99304317 A EP 99304317A EP 0962312 A2 EP0962312 A2 EP 0962312A2
Authority
EP
European Patent Office
Prior art keywords
container
weight
vessel
polystyrene resin
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99304317A
Other languages
English (en)
French (fr)
Other versions
EP0962312A3 (de
EP0962312B1 (de
Inventor
Kenzi Yokota
Takahiro Ishii
Akio Uemura
Masaru Sato
Masato Takaku
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokota Tohoko Co Ltd
Japan Polystyrene Inc
Original Assignee
Yokota Vinyl Yamagata Ltd
Japan Polystyrene Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokota Vinyl Yamagata Ltd, Japan Polystyrene Inc filed Critical Yokota Vinyl Yamagata Ltd
Publication of EP0962312A2 publication Critical patent/EP0962312A2/de
Publication of EP0962312A3 publication Critical patent/EP0962312A3/de
Application granted granted Critical
Publication of EP0962312B1 publication Critical patent/EP0962312B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2025—Multi-layered container, e.g. laminated, coated

Definitions

  • the present invention relates to a vessel and a container unit which is used to pack contents such as food. More specifically, it relates to a container unit comprising a vessel portion and a lid portion, in which the contents can be prevented from leaking and can be easily extracted by peeling a film of the lid portion by hand and which is excellent in terms of sheet moldability for the formation of the vessel portions during vacuum forming and/or air-pressure forming, and which can be molded effectively in a short time.
  • the invention comprehends an easily openable container in which the container unit is used.
  • polyolefin resin is excellent in resistance to oils and in chemical resistance to organic solvents, and it also has excellent strength.
  • the polyolefin resin is a crystalline resin, the dimensional stability after molding is low, and the stiffness is also inconveniently low.
  • the general-purpose polystyrene resin is also called a general purpose polystyrene (GPPS), and it is usually a styrene homopolymer.
  • rubber modified polystyrene resin can be obtained by polymerizing a styrene monomer in the presence of a rubbery polymer, and it is also called a high impact polystyrene (HIPS).
  • HIPS high impact polystyrene
  • the molecular structure of the polystyrene resin both a straight-chain type and a branched chain type are usable.
  • polystyrene resins examples include polyethylene, copolymers of ethylene and ⁇ -olefins having 3 to 10 carbon atoms such as ethylene-butene-1 copolymer, ethylene-hexene-1 copolymer and ethylene-4-methylpentene-1 copolymer, and propylene polymers such as polypropylene, propylene-ethylene block copolymer and propylene-ethylene random copolymer.
  • this solubility parameter can be obtained by an experiment of a viscosity method, a swelling method or the like, or by calculation on the basis of a molecular structure, and a value of the solubility parameter slightly varies with the selected method.
  • the present invention employs the method of calculating the solubility parameter on the basis of the molecular structure which has been suggested by Small. This method and theory are described in detail in "Journal of Applied Chemistry", Vol. 3, p. 71-80 (1953).
  • a ratio between the styrene monomer and comonomer for it in the styrene copolymer can be suitably decided in such a range as to give the copolymer in which the solubility parameter (SP) is in the range of 8.40 to 8.70.
  • the ratio of the comonomer in the styrene copolymer is preferably in the range of 20 to 80% by weight, more preferably 35 to 70% by weight. No particular restriction is put on a bonding style (e.g., random, block or alternate) of the styrene monomer and the comonomer in the copolymer.
  • the ratio of the polystyrene resin (A) is in the range of 1 to 96% by weight, and in the case that a layer (b) of the lid portion is the polyolefin resin, the ratio of the polystyrene resin (A) is in the range of 1 to 50% by weight, more preferably 30 to 50% by weight. In the case that the layer (b) of the lid portion is the polystyrene resin, the ratio of the polystyrene resin (A) is in the range of 96 to 50% by weight, more preferably 70 to 50% by weight.
  • An adhesive strength between the lid portion and the vessel portion can be optionally controlled by changing a composition ratio between the polyolefin resin and the polystyrene resin.
  • styrene monomer which can be used for the preparation of the component (D) styrene is usual, but there can also be used alkyl-substituted styrenes such as ⁇ -methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene.
  • predetermined amounts of the respective components are dry-blended by a mixing device such as a Henschel mixer or a tumbler, or they are sufficiently heated and kneaded at a temperature of 160 to 260°C by the use of a kneader such as a single screw extruder, a twin-screw extruder or a Banbury mixer, and then granulated.
  • a mixing device such as a Henschel mixer or a tumbler
  • a kneader such as a single screw extruder, a twin-screw extruder or a Banbury mixer, and then granulated.
  • some additives can be used, and examples of the additives include antioxidants,heat stabilizers, ultraviolet light absorbers, lubricants flame retardants, antistatic agents and mineral oils.
  • the polyolefin resin referred to herein includes olefin homopolymers, olefin copolymers obtained by copolymerizing copolymerizable olefins, and mixtures thereof.
  • a multi-layer sheet comprising two or more layers is formed, and then molded into a vessel shape by vacuum forming or air-pressure forming.
  • a single-layer film or a multi-layer film comprising two or more layers is formed, and a surface layer (a) of the film is then stuck onto a surface layer (b) thereof.
  • the vacuum forming or the air-pressure forming of the multi-layer sheet comprising two or more layers of the present invention into the vessel shape there is a known method which comprises heating the sheet by the use of a usually usable vacuum forming machine or air-pressure forming machine, pressing the sheet against to a mold and then vacuuming or air-pressing it, and then blowing air against it for several seconds to cool it. If necessary, the formed vessel is punched by a punching blade to remove unnecessary portions therefrom.
  • an easily openable container which can be easily opened can be obtained.
  • the most preferable technique for bonding both of them to each other is a heat sealing method, but it is not restrictive.
  • a bonding method by the use of a hot-melt adhesive can also be employed.
  • the portions of the vessel and the lid to be sealed are heated, and they are then pressed against each other for several seconds.
  • the container comprising the "vessel” and the “lid” which can be obtained by the present invention can be used for packing contents such as food.
  • the contents can be easily removed by peeling the film of the lid portion by hand without spilling the contents, and the container is also excellent in the moldability of a sheet for the formation of the vessel portions at the time of vacuum forming or air-pressure forming and can be molded effectively in a short time.
  • the container of the present invention is useful as the easily openable container, and the vessel portion has a relatively high stiffness. Therefore, the container of the present invention can be extremely suitably used as a package container e.g. for bean curd, pudding, jelly, yoghurt and ice cream which is sold in a supermarket or the like.
  • An intermediate layer resin was extruded by the use of the extruder having a cylinder diameter of 120 mm, and a resin for both the outer layers was extruded by the use of the extruder having a cylinder diameter of 90 mm.
  • the extrusion was carried out so that extrusion rates might be 15% by weight for both the outer layers and 70% by weight for the intermediate layer.
  • the tensile strength and the elongation at break were measured in accordance with ASTM D638. In this case, a test piece No. 1 was used and a tension speed was 200 mm/min. The tensile strength was represented by strength at break when the test piece was broken.
  • the plane impact strength was measured in accordance with ASTM D3763.
  • a weight having a load of 7.5 kg was spontaneously dropped from a height of 80 cm onto a flat surface of the test piece by the use of a "falling weight graphic impact tester" made by Toyo Seiki Manufacturing Co., Ltd., so that the test piece was completely broken or pierced with a striker attached to the lower portion of the weight.
  • the total energy value of the breakage at this time was measured.
  • the multi-layer sheet was vacuum formed into a bean curd shape at a heater temperature of 300°C by the use of a vacuum forming mold for 54 (9x6) articles.
  • One molded article had a length of 78 mm, a width of 110 mm, a depth of 43 mm and a flange width of 8 mm.
  • a cooling time depended on the samples, and the cooling was carried out, taking sufficient care so that the molded articles might not be deformed. Each cooling time was recorded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packages (AREA)
EP99304317A 1998-06-03 1999-06-03 Leicht zu öffnender Behälter und dafür geeignete Behältereinheit Expired - Lifetime EP0962312B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15477598 1998-06-03
JP15477598 1998-06-03

Publications (3)

Publication Number Publication Date
EP0962312A2 true EP0962312A2 (de) 1999-12-08
EP0962312A3 EP0962312A3 (de) 2001-05-16
EP0962312B1 EP0962312B1 (de) 2004-03-31

Family

ID=15591630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99304317A Expired - Lifetime EP0962312B1 (de) 1998-06-03 1999-06-03 Leicht zu öffnender Behälter und dafür geeignete Behältereinheit

Country Status (4)

Country Link
EP (1) EP0962312B1 (de)
KR (1) KR100354217B1 (de)
CN (1) CN1116165C (de)
DE (1) DE69915931T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160142612A (ko) 2015-06-03 2016-12-13 조승 환풍기

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH665620A5 (de) * 1984-08-21 1988-05-31 Fischer Ag Druckgusswerk Trittelement fuer fahrsteig oder -treppe.
JPH06190988A (ja) * 1992-12-25 1994-07-12 Daicel Chem Ind Ltd 耐油性熱可塑性樹脂シートおよびその成形体

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 199432 Derwent Publications Ltd., London, GB; Class A18, AN 1994-260055 XP002163054 & JP 06 190988 A (DAICEL CHEM IND LTD), 12 July 1994 (1994-07-12) *

Also Published As

Publication number Publication date
CN1116165C (zh) 2003-07-30
DE69915931T2 (de) 2004-08-12
KR20000005896A (ko) 2000-01-25
EP0962312A3 (de) 2001-05-16
KR100354217B1 (ko) 2002-09-28
CN1237509A (zh) 1999-12-08
DE69915931D1 (de) 2004-05-06
EP0962312B1 (de) 2004-03-31

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